Improvement in saw-gummers



@dimitri (fenetre :It-wt @Mitra NATEANIEL E. svrONE, DEOEASED, (AMANDAs'rONE AND BENJAMIN HOL-.

BROOK, ADMINISTRATORM OE CHICAGO, ILLiNOIs. i.'

Letters Patent No. 112,979, dated `llllal'ch 21, 1871; antedated March14, 1871.

IMPnovlawlEnT m saw-culviMi-as.

The Schedule referred to lx1-these Letters Patentand maling of the same.

y Figure 4, adetached'view, showing the journalbearings of the cutter;and

Figure 5, views of saw-teeth, -showing the effectof i the set-screw.4

Like letters refer to the same parts in all of the figures.'

This invention relates to that class of saw-gummers which is usedwith'rotary cutters; and

Its nature consists in the application of a set-screw, so that the teethof the saw will be cnt the same distance from the'points, howeverirregular the spaces between the teeth-may be; in the application of aro tilting shaft, carrying with it the Arotary cutter; and in theapplication of' a stop to limit and determine th'e cnt for each tooth ofthe saw.

To enablel others skilled in the art to make and use my invention, Iwill now describe its construction and operation. j

The frame or case F is made of cast-iron, usually cast in a singlepiece, andV ofthe form and dimensions shown, the 'drawing being fullsize. y

Inrthe curved portion F of the frame I place the shaft A, which is cutaway in the middle, as shown at' A, figs. 2 and 3, and-has its bearingsin the posts F.

At the outer end of thisshaft I attach a toothed or. cog-wheel, A',which isperated by the worm-thread C' on the shaft B, y p

The wheel-A' is usuallycast with the shaft, but it may be made separateand be attached by screws or bolts. y

At the side of this shaftI out in square recesses, as

shown at S, iig. 4, which recesses are provided with "shaft, as shown.at R, iig. 4, and the other in a hole in the neck of the shaft, asindicated by the dotted lines in tlg. 1.

` yIn these bearings I place the cutter-shat'tl, which is provided withthe cutters H. The shaft I is provided' with elongated bea1ings,so thatthe cuttercan lbe moved back and forth so as to. utilize its entirelength; otherwise ,it wouldcut continually at one point and soon wearout.

The inner end projects out sufficiently far to'ai'or-d a properattachmentfor'a crank, T.

' A t the inner end of the sh ft uniform depth, the depth beingregulated by the pin 1?,- which is placed in such one of the holes Q asmay be desired, or according to the size ofthe saw-teeth.'l

The stop N is so made and attached that it can be folded into theopening R for the purpose of permitting the withdrawal of the shaft Afor the purpose of inserting a new cutter, o'r the taking out of acutter for the purpose of sharpening it.

In order to facilitate -this withdrawal I' hang th Iworm-shaft B in amovable frame, C.

This frame is furnished with suitable bearings for the'shaft B, and isattached to the frame F bythe screw B, which acts also as a pivot, andby the screw E, which passes through a slot, D.

By loosening the screw E the frame O can be thrown back so as todisengage the worm and wheel, when, by folding in the stop N, the shaftA can be drawn out from this side of the fralne'ancl the cutter-shaft Itaken out. y

When'the shaft is-replaced the frame C is turned' so as to engage theworm with the wheel, which, b y reason of the concave `form of thefaceyof the cogs, operates acheck to prevent its falling or working outwhen the screw E is tightened.

At or near the middle of the crossbar of the:

y frame l insert' a set-screw, K, which is or may be provided with, alock-nut S'. 'Ihis screw is provided with a notch at the inner end toreceive the point of the saw-tooth, so as to prevent its being bent ordulled.

When this 'set or gauge-screw is set, as shown atV tig. 3, the toothwill 'be cut as shown at2,in lig. 5; and when it is run up against thebar 11"', the tooth will he cut as shown at l.

The saw-plate is placed in the opening or groove L', and the machine issecured to it by the thumb-screw G. In operation, when gummin-g smallteeth, when the opening between thenis about the size ofthe cutter H,the pin P is set in the-upper hole and thefgaugescrew K run down untilit comes nearly in contact with th'e shaft A. -The gulnmer is thenplaced in position and the crank I turned without revolving the shaft A.

When larger teeth are to ho gramniell, thegaugescrew is set so as togive thedesired point, and the pin It placed in one of the lower holes.

The machlleigthe,nd placed and secured in position, and the crank istaken in one hand and the shaft B iu A I placca movableV v stop N, whichlimits the movement of that shaft, and

makes the cutting between each toothof a saw of a by changing the sizeofthe wheel or the angle of the cogs that this part of the machine willnot interfere with the withdrawal of the shaft.

Having thus fully described my improved -saw gommer,

What ters Patent, is- Y 1.,The-'revolving shaft A, in combination withthe I ciaim as new, and desire to secure by Letrotary cutter,substantially as described.

' 2. The stop N, in combination with the shaft A, frame F, and pin P,when constructed and operating substantially as set forth.

3. The combination and arrangement ofthe shafts A and I with the wheelA.' and the worm B, substantially as described.

4. The pivotcd frame O, when so constructed and attached that the Wormcan be disengaged or adjusted, substantially as specified.

-5. The combination and arrangement of the shaft A, provided with theadjustable bearings M for shaft l', cutter H., Wheel A', worm B,gauge-screw K, and stop N with .the frames F and C, substantially as andfor the purposes described. o Y

' NATHANIEL F. STONE.

' Witnesses:

L. L. BOND,

